EP2567558A1 - Procédé et système pour une adaptation de taux de rétroaction quantifiée dans un système de communication - Google Patents

Procédé et système pour une adaptation de taux de rétroaction quantifiée dans un système de communication

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Publication number
EP2567558A1
EP2567558A1 EP10850964A EP10850964A EP2567558A1 EP 2567558 A1 EP2567558 A1 EP 2567558A1 EP 10850964 A EP10850964 A EP 10850964A EP 10850964 A EP10850964 A EP 10850964A EP 2567558 A1 EP2567558 A1 EP 2567558A1
Authority
EP
European Patent Office
Prior art keywords
indication
matrix index
codebook subset
subset selection
rank
Prior art date
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Granted
Application number
EP10850964A
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German (de)
English (en)
Other versions
EP2567558A4 (fr
EP2567558B1 (fr
Inventor
Mazzarese David
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to EP14165192.7A priority Critical patent/EP2757818A3/fr
Publication of EP2567558A1 publication Critical patent/EP2567558A1/fr
Publication of EP2567558A4 publication Critical patent/EP2567558A4/fr
Application granted granted Critical
Publication of EP2567558B1 publication Critical patent/EP2567558B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H04B7/0647—Variable feedback rate

Definitions

  • the present invention relates to the field of radio communication systems, and in particular to a method for adapting the feedback rate of a quantized representation of the propagation channel in a capacity-limited feedback channel.
  • MIMO OFDMA cellular systems such as 3GPP LTE or IEEE
  • closed-loop MIMO precoding is defined to enable high throughput downlink transmissions to fixed and nomadic users.
  • Feedback information is obtained at the transmitter via the report a precoding matrix index (PMI) from a receiver to a transmitter.
  • PMI precoding matrix index
  • This PMI is used to represent a matrix in a codebook (a set of matrices) , and it is used at the transmitter to derive a downlink precoder.
  • Simple codebook structures are used in the first generation of MIMO OFDMA systems, such that the PMI can be represented with a few bits.
  • Small codebooks achieve a coarse quantization of the spatial channel.
  • a 4- bit codebook is defined and the 4 -bit PMI can be reported via the a capacity- limited feedback channel called PUCCH [1,2] .
  • Precoding matrices are defined for each possible transmission rank, which determines the size of the precoding matrix.
  • the overall codebook is a set of matrices for each rank.
  • the feedback of the PMI thus consists of a rank indication (RI) and a PMI for the codebook subset of the given rank RI .
  • the rank indication is reported with a longer period than the PMI. More importantly, since the rank indication remains valid during several reports of the PMI , it must be encoded with a better error protection code in order to ensure that consecutive PMI reports are not invalidated by one erroneous RI report. In general, this is naturally ensured by the fact that the rank can take values in a limited range, such as ⁇ l, 2, 3, 4 ⁇ in LTE Rel-8, due to the limitation to a maximum of 4 antennas at the transmitter and 4 antennas at the receiver. Thus the RI can be represented by 2 bits.
  • the total size of the feedback message that contains the PMI+CQI is larger than the 4 bits used to represent just the PMI.
  • the message size will be 8 to 11 bits with one to two CQIs, respectively, in LTE Rel-8.
  • the PUCCH being transmitted in a fixed-size time- frequency resource with a fixed modulation, the 2 bits of RI that are reported individually are naturally better protected than the 8 or 11 bits of PMI+CQI that are jointly reported, since the 2 bits of RI enjoy a lower error-correction encoding rate.
  • Enhancements of the feedback for closed- loop precoding beyond the simple 4 -bit codebook or for larger transmit antenna array sizes would require more complex codebook structures, as well as a larger codebook size.
  • the feedback mechanisms should be designed accordingly, in order to take advantage of enhanced codebook properties, and to ensure smooth operation of the feedback in order to avoid disrupting propagation of feedback errors. It can be easily understood that increasing the size of the PMI without changing the reporting mechanisms could lead to situation where a very large PMI would lead to a very large feedback message, which would often be received in error. In order to cope with this situation, it would be desirable to better balance the feedback load between the RI and PMI+CQI reports. Moreover, the PUCCH design in LTE Rel-8 can accommodate a maximum of 13 information bits.
  • a first type of enhanced codebook contains matrices that provide a quantization of the MIMO propagation channel between an array of transmitting antennas and an array of receiving antennas. Due to the wide range of deployed transmit antenna arrays, such a codebook should effectively quantize single- polarized channels as well as dual -polarized channels.
  • This type of codebook naturally contains one set of matrices that quantize the single-polarized space, and a second set of matrices that quantize the dual -polarized space, as shown in Fig 1. Note that these two sets may have common elements.
  • An example of such a codebook can be found in 3GPP LTE Rel-8 specifications [1] .
  • the inner precoder has a block diagonal structure
  • the precoder could be formed as
  • the second precoder represents a co-phasing factor that takes care of short-term channel variations and can be made to adjust the structure of the overall precoder W to match either a single-polarized linear uniform array (ULA) or a cross- polarized array at the transmitter.
  • ULA linear uniform array
  • the present invention relates to a method for adapting the feedback rate of a quantized representation of the propagation channel in a capacity- limited feedback channel in a wireless communication system.
  • the wireless communication system comprises an access point (the transmitter) , which can be understood to be a base station or eNodeB, and at least one user terminal (the receiver) , which can be understood to be a mobile station or user equipment (UE) .
  • At least one reference signal to the user terminal and a feedback channel from the user terminal allow the transmission from the access point using codebook-based precoding when the access point is equipped with multiple transmit antennas.
  • a method for performing quantized feedback rate adaptation in a wireless communication system comprising: obtaining a reference signal from an access point;
  • a user terminal comprising: a deriving unit, adapted to derive a rank indication ⁇ a codebook subset selection indication and a precoding matrix index based on the obtained reference signal from an access point ;
  • a sending unit adapted to send a first feedback message conveying the rank indication and the codebook subset selection indication, and send a second feedback message conveying the precoding matrix index, to the access point ;
  • a receiving unit adapted to receive from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.
  • the method defines a format for the feedback of a first message contained in a first report including at least a rank indication and a first codebook index part, and at least one second message contained in at least one report including a second codebook index part.
  • the rank indication is jointly encoded with a first part of the codebook index in a first message.
  • Reporting a first part of the codebook acts as a type of codebook subset selection within the codebook of a given rank. This subset selection is performed by the receiver.
  • the first report enjoys better error protection than the feedback of the other part of the codebook index, which is reported in a second message contained in a second report.
  • the first report pertains to static or long-term properties of the propagation channel, such as polarizations of the elements of the transmit antenna array, or slowly drifting co-phasing factors, as exemplified by double or multiple codebook feedback structures.
  • Certain embodiments of the present invention describe methods for splitting codebook information in a physically meaningful way, such that a relevant part (herein referred to as the first part) of the codebook is reported along with the RI in a first report, while the other part (herein referred to as the second part) of the codebook is reported in the PMI along with the CQI in at least one second report.
  • the method is such that the first report enjoys better error protection than the second report.
  • the first part of the codebook represents some static or long-term statistics of the propagation channel, while the second part captures the remaining parts of the channel statistics, including adaptation to fast fading.
  • efficient encoding of the RI with the first part of the codebook is designed in a way compatible with 3GPP LTE.
  • Fig. 1 shows a codebook as a union of two sets
  • Fig. 2 shows a flowchart of a method for performing quantized feedback rate adaptation in an embodiment of the present invention
  • Fig. 3 shows the 3 -bit PUCCH report type 3a according to an first embodiment of the present invention
  • Fig. 4 shows the hybrid 2 -bit or 3 -bit PUCCH report type 3b according to the first embodiment of the present invention
  • Fig. 5 shows the encoding of 3 -bit RI according to the first embodiment of the present invention
  • Fig. 6 shows RI mapping for PUCCH report type 3a or 3b according to the first embodiment of the present invention
  • Fig. 7 shows RI mapping for PUCCH report type 3a or 3b according to the first embodiment of the present invention
  • Fig. 8 shows the 3 -bit PUCCH report type 3c according to an second embodiment of the present invention
  • Fig. 9 shows RI mapping for PUCCH report type 3c in PUCCH reporting modes 1-1, 2-1 according to the second embodiment of the present invention
  • Fig. 10 shows RI mapping for PUCCH report type 3c in PUCCH reporting modes 1-0, 2-0 according to the second embodiment of the present invention
  • Fig. 11 shows RI mapping for a 4 -bit PUCCH report type according to the second embodiment of the present invention
  • Fig. 12 shows RI mapping for PUCCH report type 3a or 3b according to an third embodiment of the present invention
  • Fig. 13 shows RI mapping for PUCCH report type 3c according to the third embodiment of the present invention.
  • Fig. 14 shows RI mapping for PUCCH report type 3a or 3b according to the third embodiment of the present invention
  • Fig. 15 shows RI mapping for PUCCH report type 3c according to the third embodiment of the present invention
  • Fig. 16 shows a bitmap message according to the third embodiment of the present invention
  • Fig. 17 shows RI mapping for a PUCCH report type according to the fourth embodiment of the present invention
  • Fig. 18 shows RI mapping for a PUCCH report type according to the fourth embodiment of the present invention.
  • FIG. 19 hows a user terminal in an embodiment of the invention .
  • the techniques described herein may be used for various broadband wireless communication systems where a transmitter is equipped with multiple antennas, where some of these antennas may have the same or different polarizations, where a codebook of precoding matrices is known by a transmitter and a receiver, and where that codebook is used for sending feedback information from the receiver to the transmitter via a capacity- limited feedback channel.
  • a user terminal In a given connection, a user terminal (receiver) is connected to an access point (transmitter) for a duration typically much longer than the transmission time interval. During this duration, the receiver would most likely feedback an N-bit PMI that belongs to a subset of matrices of a given rank, such that this subset of matrices quantizes the space according to the type of antenna polarization deployed at the transmitter, where 2 N is the number of matrices in the codebook for a given rank.
  • the complementary subset of matrices would be reported very infrequently during this time, since it does not match the actual propagation channel characteristics.
  • the present invention is defined to report in a single message a rank indication, and an indication of the codebook subset dependent on the rank indication, i.e. within the subset of matrices of that rank, such that this codebook subset is in relation to the polarization of the transmit antenna elements, in order to offer better protection to this information and to report it less frequently than the remainder of the matrix index.
  • the remained of the matrix index is reported in at least second message, and it is dependent on both the rank indication and the codebook subset selection indication.
  • the combination of the rank indication, the codebook subset selection indication and the remainder of the matrix index allows to identify a unique matrix in the codebook.
  • a single bit is needed for reporting the codebook subset according to the polarization.
  • this message only needs to be increased by one bit to three bits, offering nearly the same robust encoding as the original Rel-8 RI report of two bits.
  • the remaining N-l bits can be reported in a PMI that represents the second part of the codebook.
  • the combination of the first (RI) report and the second (PMI) report allows the transmitter to recover the full precoder recommended by the receiver .
  • the first report may contain rank indication along with information about a first part of the codebook (thus a part of the overall PMI)
  • the second report may contain only part of the overall PMI pertaining to a second part of the codebook, along with additional information such as CQI (channel quality information) and a subband index.
  • a method for performing quantized feedback rate adaptation in a wireless communication system is disclosed. Referring to Figure 2 , comprising :
  • RI reporting formats carrying 1-bit codebook subset selection related to polarization information are provided next, as exemplified in an extension of the PUCCH design of [1] .
  • the format design in Fig 3 shows the PUCCH report type payload size per reporting mode, where BP is a bandwidth part, and a 3- bit reporting type 3a is introduced.
  • the possible rank indication is limited to the range ⁇ l, 2, 3, 4 ⁇ when the transmitter is equipped with 4 or 8 transmit antenna elements but the receiver is limited to 4-layer spatial multiplexing because the receiver has 4 or fewer receive antennas.
  • Encoding in a fixed size of 3 bits may be enforced with a pre-defined encoding in case of open- loop MIMO (Modes 1-0 and 2-0) in order to keep the encoding bit size fixed for all PUCCH reporting modes using PUCCH reporting type 3a.
  • RI is just a denomination of the report, although the report contains a rank indication and additional information about a first part of a codebook .
  • RI consists of 3 -bits of information, ⁇ . e . , [o 0 o x o 2 ⁇ with of corresponding to MSB of 3 -bit input and of corresponding to
  • rank 3 of the codebook could be reported in a single report in the N-l bits PMI , leading to the RI mapping for PUCCH report type 3a or 3b shown in Fig 7. The same principle can be used for the rank 4.
  • bits m the encoding of RI m [o 0 o 1 o 2 ] is not important, as well as the ordering of the polarization and rank indications in the mapping tables.
  • RI reporting formats carrying 1-bit codebook subset selection related to polarization information are provided next, as exemplified in an extension of the PUCCH design of [1] .
  • Fig 8 shows the PUCCH report type payload size per reporting mode, where BP is a bandwidth part, and a 3- bit reporting type 3c is introduced.
  • the possible rank indication is extended to the range ⁇ l, 2, 3, 4, 5, 6, 7, 8 ⁇ when the transmitter is equipped with 8 transmit antenna elements and the receiver has at least 8 receiving antennas.
  • RI consists of 3 -bits of information, ⁇ . e . , [o 0 o 1 o 2 ⁇ with of corresponding to MSB of 3 -bit input and of corresponding to
  • the receiver will feedback several PMI+CQI reports using N-l bits for the PMI , conditioned on the previously reported RI+PI .
  • the codebook structure could be the following according to the mapping in Fig 9:
  • ULA rank 1 codebook contains at most 16 DFT beams for ULA ⁇ Xpol rank 1 : codebook contains at most 8 DFT beams for each polarization
  • codebook contains at most 16 matrices of ranks 5 and 6 for Xpol and ULA
  • ULA stands for a uniform linear array of antenna elements with the same polarization.
  • Xpol stands for an array of antenna elements where some elements have polarizations orthogonal to each other.
  • rank 5 and 6 can be encoded with N-1 bits in the second report
  • the set of matrices for ranks 7 and 8 can be encoded with N-1 bits in the second report.
  • RI provides only partial rank information, and the complete information about the rank is obtained from the second report in combination with the first report.
  • the RI report could be extent to 4 bits in case the transmitter is equipped with 8 transmit antenna elements, following a principle similar as the case of the extension from 2 bits to 3 bits when the transmitter is equipped with 4 transmit antenna elements. This is illustrated in Fig 11. A similar straightforward extension could be provided to extend the RI report from 1 bit to 2 bits in case of 2 transmit antennas at the transmitter.
  • RI reporting formats carrying 1-bit codebook subset selection related to information about a double codebook structure are provided next, as exemplified in an extension of the PUCCH design of [1] .
  • Another type of enhanced codebook contains matrices that can be expressed as a product of two matrices, Wl and W2 , such that the recommended precoder is Wl x W2.
  • the first matrix targets the report of wideband and/or long-term channel state information
  • the second matrix targets the report of narrowband ( frequency- selective) and/or short-term channel state information.
  • One advantage of this structure is that the first matrix could be used as a stand-alone wideband/long-term precoder, while in combination with the second matrix the precoder can be refined in the frequency/time domain.
  • the receiver may want to inform the transmitter about the possibility of using only the first matrix Wl as a precoder, while asking the transmitter to ignore the report of W2 or simply informing the transmitter that W2 will not be reported.
  • the receiver may determine that subband/short-term precoder information is unreliable or does not provide any expected gain over the wideband/long-term precoder information, while the reporting mode is not reconfigured by the transmitter Reporting information about the usage of Wl and W2 would allow the receiver more flexibility in precoding adaptation without any reconfiguration of the reporting mode, thus avoiding disruption of the operation and consumption of expensive resources .
  • mapping of RI bits for PUCCH report could be defined as shown in Fig 12 and 13 for a maximum of 4 -layer and 8 -layer spatial multiplexing (SM) , respectively.
  • wideband/long-term precoding alone is mostly beneficial in spatially correlated channels, so the receiver only needs to report information about the usage of the wideband/long-term precoder for low ranks.
  • Wl and W2 can be conveyed jointly along with the rank information in the PMI for high ranks, or alternatively only one part of the codebook could be reported in a fixed manner for high ranks.
  • the total reporting size is kept within 3 bits, as if only the rank was reported with values ranging from 1 to 8, thus saving resources and maintaining the coverage of the feedback channel while conveying more information.
  • a receiver's precoder recommendation and an indication whether or not some part of the codebook is transmitted in a second report can be conveyed jointly in the first report, rather than separately in the two examples shown in Figs 12, 13, 14 and 15; the recommendation of a single part of the codebook meaning that the other part of the codebook is automatically not reported in subsequent reports .
  • the receiver could provide mode information about the desired precoding vector in a double codebook structure by appending 2 bits to the RI instead of just 1 bit.
  • a bitmap indicates the assumption on the recommended precoder used as assumption in the CQI report as shown in Fig 16. If bit n set to 1 in the bitmap, it indicates that the receiver assumed the presence of Wn in the precoder as described in the double codebook structure.
  • bitmap indication could additionally be used at the transmitter to inform the receiver about the possibility of using any or a restricted set of assumptions on the recommended precoder.
  • This types of indication could be useful in scenarios where the transmitter thinks it has better knowledge about the local propagation conditions than the receiver, for example as a collection of statistical samples from a large number of receivers in the same coverage area.
  • Such an indication allows the transmitter to be in control of the range of allowed receiver-based codebook subset selection in the joint report of RI and a first part of the codebook.
  • RI reporting formats carrying 1-bit phase alignment information are provided next, as exemplified in an extension of the PUCCH design of [1] .
  • the frequency domain phase alignment factor (a scalar or vector or matrix) generally targets slowly drifting phase misalignment among transmit antenna elements, typical of an uncalibrated antenna array.
  • the slow drifting is due to changing physical parameters such as equipment temperature, which typically vary much more slowly than the transmission time interval. This is thus a rather static or very long-term channel property of the channel, which needs not be reported very frequently and is thus a good candidate for reporting along with RI .
  • 1 or 2 bits are generally sufficient to adjust the phase alignment across antenna elements across a wide bandwidth.
  • a b is a 4x2 matrix and A b , A n are 2x2 diagonal matrices containing the co-phasing factors between the polarizations, targeting wideband/long-term and narrowband/short-term statistics, respectively.
  • Narrowband/short-term co-phasing factors cope with fast fading, while wideband/long-term co- phasing factors cope with antenna calibration imperfections.
  • the rank-1 codebook may then be written as
  • a user terminal that can realize all the above method is also
  • the user terminal 1900 includes : a deriving unit 1901, adapted to derive a rank indication ⁇ a codebook subset selection indication and a precoding matrix index based on the obtained reference signal from an access point;
  • a sending unit 1902 adapted to send a first feedback message conveying the rank indication and the codebook subset selection indication, and send a second feedback message conveying the precoding matrix index, to the access point ;
  • a receiving unit 1903 adapted to receive from the access point, data precoded by a matrix derived based on the rank indication, the codebook subset selection indication and the precoding matrix index.
  • All functional units in the embodiments of the present invention may be integrated into a processing module, or exist independently, or two or more of such units are integrated into a module.
  • the integrated module may be hardware or a software module. When being implemented as a software module and sold or applied as an independent product, the integrated module may also be stored in a computer-readable storage medium.
  • the storage medium may be a Read-Only Memory (ROM) , magnetic disk or Compact Disk (CD) .
  • ROM Read-Only Memory
  • CD Compact Disk
  • 3GPP TS 36.212 "Evolved Universal Terrestrial Radio Access (E-UTRA) ; Multiplexing and channel coding"
  • 3GPP TS 36.213 "Evolved Universal Terrestrial Radio Access (E-UTRA) ; Physical layer procedures” .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention porte sur un procédé pour l'adaptation du taux de rétroaction d'une représentation quantifiée du canal de propagation dans un canal de rétroaction à capacité limitée. Le procédé comprend l'obtention d'un signal de référence à partir d'un point d'accès ; la déduction d'une indication de rang, d'une indication de sélection de sous-ensemble de livre de codes et d'un indice de matrice de précodage, sur la base du signal de référence obtenu ; l'envoi d'un premier message de rétroaction véhiculant l'indication de rang et l'indication de sélection de sous-ensemble de livre de codes, et l'envoi d'un second message de rétroaction véhiculant l'indice de matrice de précodage, au point d'accès ; et la réception, à partir du point d'accès, de données précodées par une matrice déduite sur la base de l'indication de rang, de l'indication de sélection de sous-ensemble de livre de codes et de l'indice de matrice de précodage.
EP10850964.7A 2010-05-07 2010-05-07 Procédé et système pour une adaptation de taux de rétroaction quantifiée dans un système de communication Active EP2567558B1 (fr)

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AU2010352827A1 (en) 2012-12-06
EP2567558A4 (fr) 2013-05-01
EP2567558B1 (fr) 2014-07-30
US9287959B2 (en) 2016-03-15
CN102939775B (zh) 2015-07-08
WO2011137595A1 (fr) 2011-11-10
US20130058386A1 (en) 2013-03-07
RU2516596C1 (ru) 2014-05-20
CN102939775A (zh) 2013-02-20
EP2757818A3 (fr) 2014-09-24
EP2757818A2 (fr) 2014-07-23
AU2010352827B2 (en) 2014-03-06

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